Some solutions for n=4
..0..1..0..1..2....0..1..0..2..1....0..1..0..1..2....0..1..0..1..2
..1..0..1..2..3....1..0..1..3..0....2..3..4..2..0....2..0..1..3..0
..0..2..3..4..1....2..1..2..0..1....3..2..0..3..2....3..1..2..4..5
..5..1..2..6..2....1..4..3..1..3....0..1..2..4..1....0..4..0..3..6
..2..7..0..5..3....4..0..2..3..1....1..2..5..3..2....4..6..7..6..7
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